Ultra-High Performance Fibrous Ammonia Sensor with Full Degradability

Although portable sensors with real-time NH₃ detection capability have been extensively investigated, the development and preparation of fibrous degradable NH₃ sensors combining properties including high lightweight and flexibility, high integrability, eco-friendliness, as well as excellent sensing performances still remains a great challenge. In this work, through fabricating a multicomponent aerogel fiber with three-dimensional mesoporous structure, we developed a fully degradable fibrous NH₃ sensor with super high sensing performances including high sensitivity (an ultrahigh response of 807% at 100 ppm of NH₃), rapid response speed (the response and recovery time are 24.1 and 2.2 s respectively at 100 ppm of NH₃), good selectivity, and ultralow trace levels of NH₃ monitoring capability (1 ppb). Taking advantage of its great sensing performance, we fabricated an NH₃ alert system by integrating the aerogel fiber with an alarm circuit for NH₃ leakage warning and food spoilage alerting.